What is the meaning of the title? Why does the author allude to the Wizard of Oz in the title?

The assignment is to write a argumentative three page essay with three sources analyzing Colum McCann’s essays “No Place Like Home” The essay should discuss key symbols, It should be three pages, and include three references in a fourth page MLA style Works Cited. McCann’s essay is non-fiction and speaks directly about social problems, customs and cultural problems. McCann’s essay speak honestly about real life issues today.